Self-locking adjustable rod collar



. June 1953 c. DEARDORFF ,5

' SELF-LOCKING ADJUSTABLE ROD- COLLAR Filed Jan. 3, 1949 INVE NTOR C. E. DEARDORF F ATTORNEY collar.

Patented June 16, 1953 I i I a "sELF mCKINGHDJUSTABLERODTQOLLAR liClintom'- E;: Dearilorff, Sanfl emando, Galif.,-:as-

r-zsign cri z. :zBenflixmviation- Gorporastion fiouth -:Bend,fl-.Ind.,-aaxco gporatiomof Delaware v I fkpiilictt'mli January 3, IQQQfS BriaINO FBSFKE eiiifflaims. I (crests-Psalms) w 1hi im/en'tion'relatesto collars ada l'ited to be s-produced in response' -to' a cocking -force without mountedon rods forengaging-andtrippingrvalve, appreciable'actualycocking o'f the-collar. "'switches-or*thedike' when 'the rddmove's into-=a In'the drawing predetermined position.

ten-object of -the'dnverition is to provide a simt section, showing a collar in accordancewith Lthe 52 I v i i Eig. l isaaiviewppartly schematic and partly in ple and practicable self-locking adjustablef rod tinventionzused onthepiston rodpofuaehydraulic jackiifor Jactu'atingaa astroke-limiting valve on A'nother obiect is toaprovide a self locking adzthesjztk.

'"justable rcd colla r that r'el-iably-fgrips the rod Eig; .-2i .israncendnlevations'view jofea co1lar1d 'duringnormal'operatioribut canbe' readily' moved e accordance with rther-i'inventionpzthe Jviewii being ='al0ngthe=-rod'-for adjustment of ite-longitudinal iitEkBIlI-in-.-bhei1iIIelI-+I] of Fig; 1 and gpu-smom 'irEigsfi iszazwiewzpartlyiirrssecti'on, takensalong Andther=bbjectis to' provide a self locking adthe line I II -III.ofiFigz2. jus'tabl'e cbllar' that-cannot'lrtjure the sur face of Reier-rmgt first/to. Eig,;;1;1a?1;ollar il 0 iIIPaccgrdthe rod on whioh it is-used. 1 anc'e with the invention, iszmountedronithet piston Gther morerspecific' ob'jects arid features of the trod ofrzazhydrauli'crrjack; |2;:.the; Jlatter: consisting invention will' b'ecome apparent from the Y descrip- .ofea. cylinderfsl3 andra: piston-FM. i'lThe :piston1rod tionto follow: i .:I :extends-throughra cylinder-ahead; 11:5. iThe o Essentially; the slf-Io'cking adj us'table rod col- IJDOSiGB end=ofsthecylinder fleisrclosedmyah'ead il6. lar' of2thepresentinvention -comprisesaplurality2 flhe-rcylmder iheadql. iplicwidediwithfia, fluid "of *segments preferably two) thawing: rod conginortlfl zthatismonnecte .byiailine l8i$o afj4gway tacting; cy-lindrically 'curved, concave sui faces of valve 19. The cylinde "head :16 zhasizafizportlfl the same 'radius=as that of'the rod up'on which it "-econ'nectedrbyssapipefll a?valve:.222,:and: aline 23 is to be used, which segments are urgedirrtorcontoathe 4-.WBY'SZBIIVBFEIQ. Theivalverrl-9iissalsc con- -tact with the rod by -a spring that encircles rnected;by;:a:line;24ito theioutputzotatpum zimh flan'ges -on the segments. -The' segmentszthave 2inietiofrrwhichlzisaconnected to acjsupply 0f, 1iq uid actuating skirt portions extending radially zza in:.a :reservoir v2.6.1 "Anlexhaustiline'l'fl' extends :siibstantial distancevfrom the:c0ncave rod-con- 'iromfthesvalvec o-the reservoir 2.6,:and.a:relief tacting surfacespone:ofi whichtskirtrportionsuconsvalveflflamayzb iconne'cted': betwee th 11 124 tacts the actuating armm'f' thewalvefiswitch uor r andrzfl. J the iike to =be -'contro1led, -the arrangement-being Theivalve 22 -comprises acasine havinsav We 'such that the arm ttfibe actuated iscontactecfiby -:$eat'I29 :adapte to rbe-.-c1 c :-.a 11 ,11 al 339 a portion of theski rt near its-periphery. Under :iurge'detoward th seat 2 9 by a helical compresthese conditions, the force exerted by thee-arm asionsspringrm. xgept' when 1t anhetdwofi' agairist 'the skirttends to eo'ck the collar on the iitsiaseat by a cam-=32 on a -camwhaft 33 'Which -is rod, and increases, the binding force, to prevent rotatably supported in bearing in th w :21

' slippage o'f thepollar along therod.'Grrthe bther As best shown inmigua;the a n -prohdcobking'jfdrceis produced.

h nd, theioullartcanfibe:readi1y::moved along the j'ectsii-from opposite ends ofthe'casingpf *valve rod for adjustment purposeseby pressing atrgp- ZZ and 1s urged' into the positionshown in-"Fig. '1

.positeIdiametrical, points alongthe collargsolfthat 40" bya' torsion spring w*Which-encimlesbn d I of the shaft 33 and h-as-Oneend-35'curled'around KLamavvare that it is old to employ rigid. collars an=ia1"m"- 3$ and hasitsotherend 31 rhooked'iinto .adaptedrtoabind on a rodinresponse tosacocking a=hole38-provided in'the'wall'of thevalve casing.

force. "The presentinvention differs from these 'Therangular movement ofthejshaft 33andcam prior structures in having spring-pressed seg- 145 $2 isi limited by a stop'pin4o-thatt g ments, and in the use, for the rod-contacting surthe wall of the valve 22 into an arcuate slot 4| faces of the collar segments, of a non-metallic in the hub 42 of the arm 33. When th m .3

material, such as brake lining, that is substanis free, as shown in Fig. 1, the spring 34 main t y Softe t an t e rod on which the collar is tains the camshaft 33 in one angular end position used. The soft surface prevents any possibility in which the cam 32 opens the ball valve 39. of injury to the rod. Furthermore, by virtue of However, by applying a force to the arm 36, the the fact that the collar surfaces are springlatter can be rocked against the force of the pressedinto direct engagement with the rod over spring 34 sufficiently to carry the cam 32 out of their entire areas, there is no actual cocking of Contact with the ban valve 30 permitting the the collar on the rod, the binding force being latter to seat against the seat 29.

With the 4-way valve I9 positioned as shown in Fig. 1, the pump 25 delivers the fluid through the line I8 and the port I'I into the left end of the cylinder I3, moving the piston I4 and the piston rod II to the right. At the same time, fluid in the right end of the cylinder I3 is exhausted through the port 20, the pipe 2|, the valve 22 and line 23 back through the said valve I 9 through the exhaust line 21 into the reservoir 26. This motion continues until the movement of the piston rod II carries the collar l into engagement with the arm 36 and rocks the latter to carry the cam 32 out of engagement with the ball valve 30, whereupon the latter is seated by the spring 3| and by pressure of fluid in the pipe 2i to block further exhaust of fluid from the right end of the cylinder I3 and thereby stop the piston. However, the movement of the piston can be reversed at any time by manipulat ing the valve I9 so as to connect the pump output line 24 to, the line 23, and connect the exhaust line 2'! to the line I8. -Fluidfrom the pump can 7 then flow throughthe pipe 23, and through the valve 22 by simply lifting the ball valve its seat 29.

Various types of collars canbe employed on the rod I I to actuate the arm 36. However the special collar constituting the present invention has the advantages over prior known collars that it can be adjusted longitudinally along the rod II without the use of any tools, cannot damage the surface of the rod II, and remains effective whether the rod I I is dry or oily. 1

As best shown in Figs. 2 and 3, the collar It! comprises two identical segments 50, each having a rod contacting surface 5I of some soft non-metallic material'suchas Vellumoid, Fairprene, impregnated cork, impregnated asbestos. The surface 5| on each of. the elements 50 is substantially semi-cylindrical in extent, and dimensioned to have the same radius as the rod I I on which it is to be used. a

Each segment 50 comprises a thin, relatively flat skirt member 53 and a hub element 54 projecting from one sidethereof and having in its' exterior surface a circumferentially. extending groove 55 in which asplit spring ring 52 is positioned. The ring 52. isnormallybf smaller dimensions than thehubisections 54 .so that it urges the inner surfaces 5i against the rod I I. The lining 57 'may. be cemented or bonded-in, anydesired manner to the inner surface of the segments 50,, the latter usually being of metal, although they. can be made of any material having the required strength. c

It has been found that withthe construction described, substantial axial force can be applied to the skirt of either of the segments 50 near the outer edge thereof without shifting the collar along the rod. Although the collar is prevented from actually cocking on the shaft II by virtue of the fact that the inner surfaces 5! of the segments are at all times maintained in full engagement with'the surface of the rod bythe Off thereof. snugly 4 spring 52, nevertheless, an axial force applied to a single point on one of the segments 50 tends to cock the collar on the rod and substantially increase the resistance to sliding movement along the rod.

However, when it is desired to shift the collar be employed; the use of two segments each substantially in arcuate extent has been found tov be the simplest and the most satisfactory. If a larger number of segments are employed, each segment is of course of correspondingly reduced arcuate extent. j

Although for the purpose of explaining the invention, a particular embodiment thereof has been shown and described, obvious modifications will occur to a person skilled in the art, and I do not desire to be limited to the exact details shown and described.

I claim:

1. An adjustable self-locking collar adapted for use on a cylindrical rod, said collar comprising: a plurality of similar segments, eachsegment consisting of a hub portion and a skirt portion, each hub portion having cylindrically curved inner and outer surfaces and flat end surfaces, and having axial thickness comparable to its radial thickness, and each' skirt portion being substantially thinner axially and substantially thicker radially than the hub portion and joined at its inner edge to the outer edge of said hub portion; and spring means engaging said hub portions of said segments and urging them radially inwardly; the inner surfaces of said hub portions having the same radius of curvature as the cylindrical rod for which the collar is adapted.

2. A collar according to claim 1 in whichsaid concave surfaces are of a material softer than said rod. a

3. A collar according to claim 1 in which said concave surfaces are of. a non-metallic material substantially softer than said rod.

4. A collar according to claim 1 in which said sp me ns J comprise an, annu ne;ie. ment encircling the hub portions of saidzseg- 

